Buggy code:
private receiverType , InvocationSite invocationSite ) { } int computeRelevanceForCaseMatching ( char [ ] token , char [ ] proposalName ) { } private int computeRelevanceForAnnotation ( ) { } private int computeRelevanceForAnnotationTarget ( TypeBinding typeBinding ) { } private int computeRelevanceForClass ( ) { } private int computeRelevanceForEnum ( ) { } private int computeRelevanceForInterface ( ) { } private int computeRelevanceForMissingElements ( boolean hasProblems ) { } int computeRelevanceForQualification ( boolean prefixRequired ) { } int computeRelevanceForRestrictions ( int accessRuleKind ) { } private int computeRelevanceForStatic ( boolean onlyStatic , boolean isStatic ) { } private int computeRelevanceForEnumConstant ( TypeBinding proposalType ) { } private int computeRelevanceForException ( ) { } private int computeRelevanceForException ( char [ ] proposalName ) { } private int computeRelevanceForExpectingType ( TypeBinding proposalType ) { } private int computeRelevanceForExpectingType ( char [ ] packageName , char [ ] typeName ) { } private int computeRelevanceForInheritance ( ReferenceBinding receiverType , ReferenceBinding declaringClass ) { } int computeRelevanceForInterestingProposal ( ) { } private int computeRelevanceForInterestingProposal ( Binding binding ) { } private void computeUninterestingBindings ( ASTNode parent , Scope scope ) { } private void findLabels ( char [ ] label , char [ ] [ ] choices ) { } private void findLocalMethodDeclarations ( char [ ] methodName , MethodBinding [ ] methods , Scope scope , ObjectVector methodsFound , boolean exactMatch , ReferenceBinding receiverType ) { } private void createTypeVariable ( TypeVariableBinding typeVariable , Scope scope , StringBuffer completion ) { } private void createType ( TypeBinding type , Scope scope , StringBuffer completion ) { } private void createVargsType ( TypeBinding type , Scope scope , StringBuffer completion ) { } private char [ ] createImportCharArray ( char [ ] importedElement , boolean isStatic , boolean onDemand ) { } private void createMethod ( MethodBinding method , char [ ] [ ] parameterPackageNames , char [ ] [ ] parameterTypeNames , char [ ] [ ] parameterNames , Scope scope , StringBuffer completion ) { } private boolean isIgnored ( int kind , boolean missingTypes ) { } private boolean isIgnored ( int kind ) { } private boolean isIgnored ( int kind , int requiredProposalKind ) { } private void findMethods ( char [ ] selector , TypeBinding [ ] typeArgTypes , TypeBinding [ ] argTypes , ReferenceBinding receiverType , Scope scope , ObjectVector methodsFound , boolean onlyStaticMethods , boolean exactMatch , boolean isCompletingDeclaration , InvocationSite invocationSite , Scope invocationScope , boolean implicitCall , boolean superCall , boolean canBePrefixed , Binding [ ] missingElements , int [ ] missingElementsStarts , int [ ] missingElementsEnds , boolean missingElementsHaveProblems , char [ ] castedReceiver , int receiverStart , int receiverEnd ) { } private char [ ] [ ] findMethodParameterNames ( MethodBinding method , char [ ] [ ] parameterTypeNames ) { } private void findNestedTypes ( char [ ] typeName , SourceTypeBinding currentType , Scope scope , boolean proposeAllMemberTypes , ObjectVector typesFound ) { } private void findPackages ( CompletionOnPackageReference packageStatement ) { } private void findParameterizedType ( TypeReference ref , Scope scope ) { } private void findTypeParameters ( char [ ] token , Scope scope ) { } private void findTypesAndPackages ( char [ ] token , Scope scope , boolean proposeBaseTypes , boolean proposeVoidType , ObjectVector typesFound ) { } private void findTypesAndSubpackages ( char [ ] token , PackageBinding packageBinding , Scope scope ) { } private void findTypesFromStaticImports ( char [ ] token , Scope scope , boolean proposeAllMemberTypes , ObjectVector typesFound ) { } private void findVariablesAndMethods ( char [ ] token , Scope scope , InvocationSite invocationSite , Scope invocationScope , boolean insideTypeAnnotation , boolean insideAnnotationAttribute ) { } private void findLocalMethodsFromStaticImports ( char [ ] token , Scope scope , InvocationSite invocationSite , Scope invocationScope , boolean exactMatch , ObjectVector methodsFound , boolean proposeMethod ) { } private void findFieldsAndMethodsFromStaticImports ( char [ ] token , Scope scope , InvocationSite invocationSite , Scope invocationScope , boolean exactMatch , boolean insideAnnotationAttribute , ObjectVector localsFound , ObjectVector fieldsFound , ObjectVector methodsFound , boolean proposeField , boolean proposeMethod ) { } private char [ ] [ ] findVariableFromUnresolvedReference ( LocalDeclaration variable , BlockScope scope , final char [ ] [ ] discouragedNames ) { } private char [ ] [ ] findUnresolvedReferenceAfter ( int from , BlockScope scope , final char [ ] [ ] discouragedNames ) { } private void findUnresolvedReference ( int completedNameStart , int completedNameEnd , BlockScope scope , char [ ] [ ] discouragedNames ) { } private char [ ] [ ] findUnresolvedReferenceBefore ( int recordTo , int parseTo , BlockScope scope , final char [ ] [ ] discouragedNames ) { } private void findVariableName ( char [ ] token , char [ ] qualifiedPackageName , char [ ] qualifiedSourceName , char [ ] sourceName , final TypeBinding typeBinding , char [ ] [ ] discouragedNames , final char [ ] [ ] forbiddenNames , int dim , int kind , int modifiers ) { } private void findVariableNames ( char [ ] name , TypeReference type , char [ ] [ ] discouragedNames , char [ ] [ ] forbiddenNames , int kind , int modifiers ) { } private ImportBinding [ ] getFavoriteReferenceBindings ( Scope scope ) { } public AssistParser getParser ( ) { } private char [ ] getCompletedTypeSignature ( ReferenceBinding referenceBinding ) { } private static char [ ] getRequiredTypeSignature ( TypeBinding typeBinding ) { } protected boolean hasPossibleAnnotationTarget ( TypeBinding typeBinding , Scope scope ) { } protected void reset ( ) { } private void setSourceAndTokenRange ( int start , int end ) { } private void setSourceAndTokenRange ( int start , int end , boolean emptyTokenAdjstment ) { } private void setSourceRange ( int start , int end ) { } private void setSourceRange ( int start , int end , boolean emptyTokenAdjstment ) { } private void setTokenRange ( int start , int end ) { } private void setTokenRange ( int start , int end , boolean emptyTokenAdjstment ) { } private char [ ] [ ] computeAlreadyDefinedName ( BlockScope scope , InvocationSite invocationSite ) { } private void computeAlreadyDefinedName ( SourceTypeBinding receiverType , ClassScope scope , boolean onlyStaticFields , InvocationSite invocationSite , ArrayList result ) { } private void computeAlreadyDefinedName ( FieldBinding [ ] fields , Scope scope , boolean onlyStaticFields , ReferenceBinding receiverType , InvocationSite invocationSite , ArrayList result ) { } int computeBaseRelevance ( ) { } int computeRelevanceForResolution ( ) { } int computeRelevanceForResolution ( boolean isResolved ) { } private void computeExpectedTypes ( ASTNode parent , ASTNode node , Scope scope ) { } private void computeExpectedTypesForAllocationExpression ( ReferenceBinding binding , Expression [ ] arguments , Scope scope , InvocationSite invocationSite ) { } private void computeExpectedTypesForMessageSendForInterface ( ReferenceBinding binding , char [ ] selector , Expression [ ] arguments , ReferenceBinding receiverType , Scope scope , InvocationSite invocationSite , boolean isStatic ) { } private void computeExpectedTypesForMessageSend ( ReferenceBinding binding , char [ ] selector , Expression [ ] arguments , ReferenceBinding receiverType , Scope scope , InvocationSite invocationSite , boolean isStatic ) { } private void addExpectedType ( TypeBinding type , Scope scope ) { <START_BUG> if ( ( type == null ) || ( ! ( type . isValidBinding ( ) ) ) ) <END_BUG>

Fix:
if ( ( ( type == null ) || ( ! ( type . isValidBinding ( ) ) ) ) || ( type == ( TypeBinding . NULL ) ) )